1> For water stains or slight stains:Wipe it offby saoked washcloth with detergent or soap

2> For scratch on surface:* Slight scratch:A. Using 180-400 grit sandpaper to wipe it away, then cleaning it with washclothB. To reach matte suface, polish it with 400-600grit sandpaper to earose sratchesC. Recovering it with detergent and washcloth.(Sandpaper will be prodvided with bathtubs together)

* Heavy scratch:It can be repaired by polishing machine, and clean again with washcloth.